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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4156) Seeking to a negative position should throw an IOE
Date Fri, 09 Nov 2012 20:27:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494286#comment-13494286
] 

Hadoop QA commented on HDFS-4156:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12552872/HDFS-4156-3.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3474//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3474//console

This message is automatically generated.
                
> Seeking to a negative position should throw an IOE
> --------------------------------------------------
>
>                 Key: HDFS-4156
>                 URL: https://issues.apache.org/jira/browse/HDFS-4156
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Reisman
>              Labels: newbie
>         Attachments: HDFS-4156-1.patch, HDFS-4156-2.patch, HDFS-4156-3.patch
>
>
> Credit to [~vanzin] for finding this. If you seek() to a position before the start of
the file, the seek() call succeeds, and the following read() call throws an NPE. A more friendly
approach would be to fail the seek() call.
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:670)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:685)
> at java.io.DataInputStream.read(DataInputStream.java:83)
> at fstest.main(fstest.java:12)
> {noformat}

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